JP2002282610A - Sand-collecting device of sedimentation basin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a spreading of water jetted by nozzles becomes larger, a force for pushing/flowing the sand is reduced, it is required that the number of nozzles is increased in order to compensate this and as a result, a power required for it becomes larger in a conventional sand-collecting pit of a sand-collecting device. SOLUTION: In the sand-collecting device of a sedimentation basin, a sediment sand is collected to the sand-collecting pit 3 provided on a bottom of the basin and is discharged by a sand-pumping pump 5 of which a suction port is faced into the sand-collecting pit 3. Partitions 7 are provided so as to divide a bottom part of the sand-collecting pit deposited with the sediment sand to a plurality of zones 33, 34 and water-jetting nozzle 8 for bringing the sediment sand to a direction of the suction port of the sand-pumping pump 5 are arranged at the zones.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sand basin for a sewage treatment plant, in which sand contained in the sewage is settled and discharged by a sand pump, and the sand deposited on the bottom of the pond is removed. The present invention relates to a sand collecting device for collecting at a position of a sand pump.

[0002]

2. Description of the Related Art Conventionally, a sand basin for removing sand and the like contained in sewage has been provided, and a sand basin facility for depositing sand and the like therein and removing the sand has been used. In order to remove the sediment deposited in this sand basin, a nozzle is arranged at the bottom of the pond, pressure water is jetted from this nozzle to flush out the deposited sand, and this is collected in a separately provided sand collection pit. There is a sand basin facility that discharges sand along with water to the outside of the pond with a sand pump installed inside. Alternatively, there is a sand basin facility where a screw is placed at the bottom of the pond and the sediment is collected in a sand collecting pit. The sand collected in the sand collecting pit is sucked up by the sand pump, but due to the structure of the sand basin, the width of the sand collecting pit usually exceeds the suction range of the sand pump. As a result, suction remains, which gradually grows and does not function as a sand collecting pit. In order to solve this problem, there is a method in which nozzles are arranged on both inclined walls of the sand collecting pit, and the nozzles are used to transfer the sand to the vicinity of the sand pump, thereby eliminating remaining suction.

[0003]

However, in the sand collecting pit described above, the spread of the water jetted by the nozzles becomes large, and the force for pushing out the sand decreases. To compensate for this, the number of nozzles must be increased. As a result, there is a problem that the power required for it also increases. An object of the present invention is to solve the above-mentioned problems and to provide a sand collecting device for a sand basin requiring less power.

[0004]

Means for Solving the Problems A first invention of the present application is a method of collecting sediment in a sand collecting pit provided at the bottom of a pond, and discharging the sediment by a sand pump with a suction opening facing the sand collecting pit. A sand collecting device for a pond, wherein a partition is provided so as to divide the bottom of a sand collecting pit in which sediment accumulates into a plurality of zones, and a nozzle for water jetting which sends sand to a direction of a suction port of a sand pump is provided. A sand collecting device for a sand basin, which is arranged in a zone.

The second invention of the present application has a sand collecting pit at the bottom of the pond and a plurality of grooves directed toward the sand collecting pit, and a nozzle for jetting water in the direction of the sand collecting pit in the groove. A sand collecting device of a settling basin, wherein the sand collecting pit is formed in a substantially inverted truncated pyramid shape, and a partition is provided so as to divide the sand collecting pit into a plurality of zones, and faces each zone partitioned by the partition. A sand collecting device for a sand basin, in which a nozzle for jetting water is arranged.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the sand collecting device of the present invention will be described with reference to the drawings. FIG. 1 is an elevational view showing an overall outline of a sand basin according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a plan view showing a sand collecting apparatus of the present invention, and FIG. FIG. 4 is a view taken along the line AA in FIG. 3. In the figure, reference numeral 1 denotes a sand basin, in which sewage flows in the direction of arrow I, and a screen 2 is attached to the sewage inflow side, whereby relatively large suspended matter in the sewage flowing into the sand basin 1 is removed. . A sand collecting pit 3 is formed in the center of the bottom of the sand basin 1 in the longitudinal direction, and six rows of grooves 4 are provided at the bottom of the pond toward the sand collecting pit 3 so as to slope down from both sides. Can be A sand pump 5 is provided in the sand collecting pit 3, and the sand pump 5 can be moved up and down by a lifting device (not shown). Then, it is placed in the sand collecting pit 3.

At the bottom 41 of each groove 4, one nozzle 6 for jetting water is arranged in the width direction of the groove 4, and when this is one stage, three nozzles are arranged in the longitudinal direction of the groove 4. You. Nozzle 6
Is set so that the water then spouts in the direction of the sand collection pit 3. By arranging the nozzle 6 at the bottom of the groove 4, the jet water and sand from the nozzle 6 are concentrated in a relatively narrow area in the groove 4, so that the kinetic energy of the jet water can be used effectively. it can.

As shown in FIGS. 3 and 4, the sand collecting pit 3
Inside, a partition plate 7 is provided substantially at the center of the inclined wall 31 in the width direction to divide the inclined wall 31 and the bottom 32 into two zones 33 and 34. Each zone 33, 34 is provided with a nozzle 8 for water injection. As described above, the jet water from the nozzle 8 is concentrated in the relatively narrow zones 33 and 34, so that the kinetic energy of the jet water can be used effectively. Therefore, the sand accumulated in the sand collecting pit 3 can be reliably transferred to the suctionable range of the sand pump 5.

A pump well 9 is provided on the outflow side of the sand basin 1 to temporarily store the sewage from which sand has been settled and removed in the sand basin 1, and transfers the sewage to a next step by a transfer pump 10. To the first settling basin (not shown). A supply pump 11 is disposed in the pump well 9, and the supply pump 11 removes sewage in the pump well 9 from a water tank 12.
The water (contaminated water) is supplied from the water tank 12 to the water pipe 7 by the pressurizing pump 13. Water (sewage) supplied from the pressurizing pump 13 is supplied to water pipes 7 and 8.
Through the nozzle 6 and into the groove 4. In the present embodiment, the wastewater from which some sand has been removed is taken from the pump well 9 and supplied to the nozzle 6. However, the present invention is not limited to this. For example, overflow water from the first sedimentation basin or final water Overflow water from the sedimentation basin may be supplied.

In the sand basin, the work for removing the sand is performed at appropriate intervals, for example, about once a week. At that time, stop the inflow of sewage into the sand basin 1
Stop the flow of water inside. Thereafter, water is spouted from the nozzle 6 to transfer the sediment deposited on the bottom of the pond into the sand collecting pit 3. During that time, water is ejected from a nozzle 8 installed in the sand collecting pit 3 to transfer the sand accumulated in the sand collecting pit 3 into the suction range of the sand collecting pump 3,
Is operated to discharge earth and sand and water to the outside of the sand basin 1 so that appropriate treatment is performed.

[0011]

According to the present invention having the above-described structure, it is possible to provide a sand collecting device for a sand basin facility requiring less power.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an entire embodiment according to the present invention.

FIG. 2 is a plan view of a sand basin according to the present invention.

FIG. 3 is a plan view showing a sand collecting device of the present invention.

FIG. 4 is a view taken in the direction of arrows AA in FIG. 3;

[Explanation of symbols]

1 settling basin, 3 sand collecting pits, 4 grooves, 5 sand pumps, 6 nozzles, 7 partition plates, 8 nozzles, 9 pump wells, 11 supply pumps, 33, 34 zones

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazunari Ochiai 5200 Mikajiri, Kumagaya-shi, Saitama F-term in the Environmental Engineering Division, Hitachi Metals Co., Ltd. 2D063 DB01 DB05 DB07 DC07

Claims (2)

[Claims] 1. Collecting sediment in a sand collecting pit provided at the bottom of the pond,
A sand collecting device of a sand basin that discharges sand with a sand pump with a suction opening facing the sand collecting pit, and a partition is provided so as to divide the bottom of the sand collecting pit where the sand is accumulated into a plurality of zones, A sand collecting device for a sand basin, characterized in that a nozzle for jetting water for drawing sand in a direction of a suction port of a sand pump is arranged in the zone. 2. A sand collecting pit having a sand collecting pit at the bottom of the pond and a plurality of grooves directed toward the sand collecting pit, and having a nozzle for jetting water in the direction of the sand collecting pit in the groove. In the device, the sand collecting pit is formed in a substantially inverted truncated pyramid shape, and a partition is provided so as to divide the sand collecting pit into a plurality of zones. A sand collecting device for a sand basin, which is arranged.